Владимир Гардин

Professor Shakhrov

Николай Кутузов

Kuznetsov

M. Tulupov

Professor Yaroshevskiy

Khakim Davletbekov

Khakim

Евгения Пырялова

Zhenya Maltseva

Борис Азаров

Zaretskiy

Kheyhana Tastakhova

Young kazakh woman

Сергей Голубев

Telegraph operator

V. Zakharov

Guryev, student (uncredited)

Николай Мичурин

Factory worker (uncredited)

Владимир Ромашков

Scientist (uncredited)

Vladimir Stukachenko

Factory worker (uncredited)